Pope Benedict XVI, delivers his blessing before the signing of the post-Synodal Apostolic Exhortation of the special assembly for the Middle East of the Synod of Bishops, at St. Paul's Basilica, in Harissa east of Beirut, Lebanon, Friday Sept. 14, 2012.Pope Benedict XVI appealed for peace Friday at a time of deep turmoil in the Middle East, calling the flow of weapons into Syria a \"grave sin\" as the country endures a bloody civil war. The pope arrived in Lebanon for a three-day visit despite the recent